It wasn't GB final results as that would have been King then Garrity. BSI picked Garrity and Lambert. Lambert was not even in the British final having failed in the semi.
Jason Bunyan, James Sarjeant, Andrew Appleton and Phil Morris have all raced in the NZ titles (and won them a few times between them!) and the Aussies had Nicholls and Lindgren in their a few years ago. So you can invite anyone you like in theory. Lambert does NOT have an ACU license as the SCB have said that is why he didn't do the U21 rounds as they could not nominate him and presumably the DMSB picked Germans.